Composition for treating concrete surfaces



UNITED STATES PATENT OFFICE.

ANDREW R. GREEN AND HARRY I. ROSCOE, OF JOPLIN, MISSOURI.

COMPOSITION FOR TREATING CONCRETE SURFACES.

No Drawing.

L7 '0 all whom it may concern:

Be it known that we, ANDREW R. GREEN, and HARRY L. Rosoon, citizens of the United States, residing at Joplin, in the county of Jasper and State of Missouri, have invented certain new and useful Improvements in Compositions for Treating Concrete Surfaces, of which the following is a specification.

This invention relates to certain improvements in liquid compositions for treating a concrete surface, and it is primarily an object of the invention to provide a novel and improved composition or solution which serves to recrystallize the surface of old concrete and is adapted to be particularly used in connection with old concrete floors and platforms which haye been subjected to hard Wear due to trucking and the like.

Our improved composition or solution comprises a mixture of one gallon as follows:

Aluminum sulfate 16 oz. Sulfuric acid 1 oz. VVa-ter 111 on.

In mixing the composition, the aluminum sulfate is first added to the Water and such mixture is stirred until all of the salt is dissolved and then the sulfuric acid is added. In practice, one gallon of the foregoing composition or solution is mixed with two gallons of water and which is applied as the first coatingto the concrete'surface to be treated. I The surface is thoroughly wet with this solution and maintained wet for a period of about one and one-half hours. After this period, the surface is cleaned off by the use of rubber window squibs, or the like, and the concrete is then permitted to dry for one hour when a second coat of ti e (solution or composition is applied. The second coat comprises one gallon of the composition or Solution diluted within one and one-half gallons of water and which second coat is applied in the same manner as has just been referred to with respect to the first coat. For the third coat, one gallon of Specification of Letters Patent.

Application filed April 21, 1920.

Patented Mar. 15, 1921.

Serial No. 375,517.

. composition or solution is precipitated bv the caustic lime within the cement and therey forming crystals of calcium aluminum sulfate which spread over the entire stir face of the concrete. The aluniinates formed react with the water used in the solution or composition to form hydrated alumina. This hydrated alumina is, as is well known, a colloid anc, when formed under tie conditions as this solution is applied, constitutes a cementitious material which resets the exposed surface of the concrete. The sulfuric acid is added to produce the energy for the penetration that talres place and to supply an excess of sulfate for the production of the calcium aluminate crystals.

.Vhen concrete floors or platforms become old and worn, the dust from them is composed of the lime portions of the cement and wearing down exposes the softer portions of the concrete, when our improved solution or composition is added to this character of surface, a great supply of calcium salts is supplied which form a. considerable amount of aluminate crystals which results in a hard surface after set ting.

Vi e claim:

l. A composition for treating a concrete surface comprising aluminum sulfate, 16 02., sulfuric acid, 1 0a., and water, 111 02.

2. A liquid composition for treating; a concrete surface including aluminum sulfatc 16 oz. and sulfuric acid, 1 oz.

In testimony whereof we hereunto affix our signatures.

ANDREYV R. GREEN. HARRY L. ROSCOE. 

